<template>

  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo.png"
             height="60px"
             alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info"
                 @click="logout">退出</el-button>
    </el-header>

    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">

        <div class="toggle-button" @click="toggleCollapse">|||</div>

        <!-- 侧边栏菜单区 -->
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409BFF"
                 unique-opened
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 router
                 :default-active="activePath"
                 >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!-- 二级菜单模板 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>

          </el-submenu>
        </el-menu>

      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'el-icon-user-solid',
        103: 'el-icon-s-tools',
        101: 'el-icon-s-goods',
        102: 'el-icon-s-order',
        145: 'el-icon-s-marketing'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()

      this.$router.push('/login')
    },

    // 获取所有菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('/menus')

      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

      this.menuList = res.data
      console.log(res)
    },

    // 点击按钮切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },

    // 保存激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0px;
  text-align: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
  .el-button{
    height: 40px;
    margin-top: 10px;
  }
}
.el-aside {
  background-color: #333744;
  .el-menu{
    border-right: 0px;
  }
}
.el-main {
  background-color: #eaedf1;
}
.toggle-button{
  background-color: #4A5064;
  color: #fff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
